Can we set targets for ourselves in the forex?

The level of uncertainty in the market means for every prediction you make in the forex, there still a possibility of the prices moving in a negative direction to that which you expected. This means we are never sure of the outcome, even the best signals still fail. The US federal bank might announced a bounce in economy and employment, yet the US dollar would still suffer a dive down. So if you are not certain of what will pop up tomorrow, is it realistic to set targets in the forex market. If we cannot confidently say how our trades would turn out, can we make plans and set goals for ourselves in the forex?